chap1.log

This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) (preloaded format=pdflatex 2015.5.24)  26 MAR 2016 01:01
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**chap1.tex
(./chap1.tex
LaTeX2e <2015/01/01>
Babel <3.9l> and hyphenation patterns for 79 languages loaded.
./chap1.tex:7: Undefined control sequence.
l.7 \chapter
            {1. Introduction}
? 
./chap1.tex:7: Emergency stop.
l.7 \chapter
            {1. Introduction}
End of file on the terminal!

 
Here is how much of TeX's memory you used:
 5 strings out of 493089
 119 string characters out of 6134842
 53199 words of memory out of 5000000
 3590 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 5i,0n,1p,91b,8s stack positions out of 5000i,500n,10000p,200000b,80000s
./chap1.tex:7:  ==> Fatal error occurred, no output PDF file produced!